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At the fifth second, the velocity of an object moving along a horizontal line is -3m/s...

  1. At the fifth second, the velocity of an object moving along a horizontal line is -3m/s . The object’s acceleration function is given by at=-t2+4.
  1. Find the velocity of the object at the 10th second of motion.
  2. Find the time when the acceleration is zero.
  1. Starting from 3m, W an object moved according to vt=2t-3 .

               Find the position of the object at the 20th second of motion.

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time never be negative

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